• Good Day:  Are you referring to:

improvement rate difference (IRD)

robust improvement rate difference (R-IRD) 

• The attached may be of use: Slides 46-57

Overlap Methods derived from Visual Analysis in Single Case Research Methodology, Erin Barton In collaboration with Brian Reichow and Mark Wolery

Topics include:

Rationale and History of Overlap Methods

Overview of Methods and their Problems

PND

PEM

PEM-T (ECL)

PAND

R-IRD*

NAP*

TauU*

Recommendations for Overlap Methods

Available here: [Long Link]

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjX5uuR06DRAhXDtRQKHRKcAusQFggZMAA&url=http%3A%2F%2Fwww.nccsite.com%2Fevents%2FSCDInstitute2014%2Fwp-content%2Fuploads%2F2014%2F08%2FBarton-Erin-Overlap-Methods-derived-from-Visual-Analysis-in-Single-Case-Research-Methodology.pptx&usg=AFQjCNHYtzwFU2soQTa55Kzjx__mG838RQ&sig2=d4mtSuSSBTq-B_iuek8FIA

Cheers,

Leo

Thank you for replying. Yes, I am referring to Improvement Rate Difference and Robust- Improvement Rate Difference.

I have referred the Barton,Reichow, Wolery  ppt. I am confused about how the quadrants are formed and how they are balanced so that the following calculations are possible as shown on slides 56 and 57.

Where can I find this explanation?Is there a video tutorial that explains this?

Thank you 

Swati

Thank you for your help. This confirms the calculations I did after getting some help from a colleague. If you have a program that you can share, I would much appreciate it. 

Kind regards 

Swati

Can anyone explain me how can i calculate the ird in single case research when the most of the data points in the baseline are over than the data points in the treatment phase?

and generally can i convert the pnd to ird ?